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I got a Check Engine light the other day stating, “P0144 O2 Sensor Circuit High Voltage Bank 1 Sensor 3”. I replaced the O2 Sensor after the Cat, Post-cat and no change in the Voltage Reading on that sensor’s Live Data. The Check engine hasn’t been back on since I cleared the code but, I have a rough idle with occasional Surge and bad fuel economy. The wiring looks okay going to the sensors. There are 4 O2 Sensors on this 97 Blazer with the 4.3L. I messed up what I was saying in the video, meant to say after the cat. Any Suggestions?
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I got a Check Engine light the other day stating, “P0144 O2 Sensor Circuit High Voltage Bank 1 Sensor 3”. I replaced the O2 Sensor after the Cat, Post-cat and no change in the Voltage Reading on that sensor’s Live Data. The Check engine hasn’t been back on since I cleared the code but, I have a rough idle with occasional Surge and bad fuel economy. The wiring looks okay going to the sensors. There are 4 O2 Sensors on this 97 Blazer with the 4.3L. I messed up what I was saying in the video, meant to say after the cat. Any Suggestions?
I think it’s strange they labeled it that. Usually bank 1 sensors are before the cat. That said, the voltage readings on the sensor after the cat should remain steady if the catalytic converter is working properly. More info here.
That said it may be some other sensor that’s the issue or you may have an issue with the catalytic converter as the article College man posted says. I suppose it could also be a wiring or connector problem but I’m not seeing that at the moment.
Thanks Eric! So since the light hasn’t come back on with any further codes and the post cat sensor seams to read pretty steady is it safe to say that maybe I had a rich condition that tripped the light in the first place. I recently replaced the exhaust on my own from the cat back. I’m going to reset the PCM and drive a new drive cycle and see what happens. It’s due for emissions in a month. I hope that it’s not the cat going! Can’t afford that. I do get a strong exhaust odder. Then again those spider injectors can cause this two with the mileage. 142k.
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